Nebula
Cave Nebula
Nebula · C9 · Sh2-155
Nebula in Cepheus
Photo: en:User:Hewholooks · CC BY 3.0 · Wikimedia Commons
Sh 2-155 is a diffuse nebula in the constellation Cepheus, within a larger nebula complex containing emission, reflection, and dark nebulosity. It is widely known as the Cave Nebula, though that name was applied earlier to Ced 201, a different nebula in Cepheus. Sh 2-155 is an ionized H II region with ongoing star formation activity, at an estimated distance of 725 parsecs from Earth.
Description from Wikipedia (CC BY-SA 4.0).
In your sky
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Key facts
Distance
~2,800 light-years
Apparent mag.
+7.7
Apparent size
50.0′ × 30.0′
Best seen with
Binoculars
Catalogue
C9 · Sh2-155
Did you know
- Listed as Caldwell 9 in the Caldwell catalogue, also known as Sh2-155.
- Found in the constellation Cepheus.
- Within reach of ordinary binoculars under dark skies.
